unit 6: sacral plexus, anterior division

Question 1

the sacral plexus is formed by th APR of __,__, __-__, and part of ___. they all divide into anterior & posterior divisions after exiting their IVF/SACRAL foramen

Answer 1

L4, L5
S1-S3
S4

Question 2

contributions from L4 & L5 to the sacral plexus are via the

Answer 2

lumbosacral trunk

Question 3

the sacral plexus forms on the ANTERIOR surface of the ___ muscle

Answer 3

piriformis

Question 4

-nerve to quadratus femoris & gamellus inf.
-pudendal nerve
-muscular branches
-pelvic splanchnic nerves
all belong to the ___ division of the sacral plexus

Answer 4

anterior

Question 5

this nerve contains fibers from the L4, L5 & S1 nerves, and contribute to lateral rotation & ADDuction of the thigh

Answer 5

nerve to quadratus femoris & gamellus inferior

Question 6

the nerve to quadratus femoris and gemellus inferior leaves the pelvis thru the

Answer 6

greater sciatic foramen

Question 7

nerve carrying fibers from L5, S1, S2, and contributes to lateral rotation & ABduction of thigh

Answer 7

nerve to the obturator internus and gemellus superior

Question 8

nerve to obturator internus and gemellus superior gives off branches to GS after leaving the pelvis thru the __ __ foramen, then re-enters the pelvis thru the __ __ foramen to supply the OI

Answer 8

greater sciatic

lesser sciatic

Question 9

nerve containing fibers from S2, S3 and S4

Answer 9

pudendal

Question 10

the pudendal nerve leaves the pelvic cavity thru the __ ___ __, arches around the ischial spine and into perineum via the __ __ __

Answer 10

greater sciatic foramen

lesser sciatic foramen

Question 11

after entering the perineum, the pudendal nerve travels & gives off branches in the __ __, inferior to the pubic symphysis to reach the dorsal side of the penis or clitoris

Answer 11

pudendal canal

Question 12

the ___ ___ nerves off the pudendal carry sensory info from the skin around the anus & inf 2/3 of anal canal as well as motor supply to the __ __ __

Answer 12

inferior rectal

external anal sphincter

Question 13

the __ nerve is given off the pudendal and divides into deep (motor) and superficial (sensory) branches

Answer 13

perineal

Question 14

four muscles supplied by the deep branches of the perineal nerve

Answer 14

external anal sphincter
bulbospongiosus
ischiocavernosus
superficial transverse perineus

Question 15

the superficial perineal branches carry sensory to these three things in MALES

Answer 15

posterior scrotum
urethral mucosa
bulb of penis

Question 16

the superficial perineal branches carry sensory to these three things in FEMALES

Answer 16

labium majus
external urethral orifice
vestibule

Question 17

terminal branch of the pudendal nerve

Answer 17

dorsal nerve of the penis/clitoris

Question 18

two motor supplies via the dorsal nerve of the penis/clitoris

Answer 18

deep transverse perineus

urethral sphincter muscle

Question 19

the dorsal nerve carries sensory fibers from these three things in males

Answer 19

corpus cavernosum
glans penis
skin over penis

Question 20

the dorsal nerve carries sensory fibers from these two things in females

Answer 20

corpus cavernosum

clitoris

Question 21

muscular branches off the sacral plexus contain fibers from S4 supply these two muscles

Answer 21

levator ani

coccygeus

Question 22

the pelvic splanchnic nerves contain fibers from

Answer 22

S2-S4